<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>利用函数求任意两数之和</title>
</head>
<body>
    <script>
        var num1 = prompt('请输入第一个数字：');
        var num2 = prompt('请输入第二个数字：');
        function getSum(num1, num2) {
            return sum = parseFloat(num1) + parseFloat(num2);
        }
        getSum(num1, num2);
        alert('您输入的两个数之和是：' +sum );
    </script>
</body>
</html>